force OMP off in strain scripts

scripts/spam-discreteStrain

@@ -32,6 +32,7 @@ either projected back to grains (whereby the value at each grain is a weighted l
 
 import os
 os.environ['OPENBLAS_NUM_THREADS'] = '1'
+os.environ['OMP_NUM_THREADS'] = '1'
 
 import argparse
 import numpy

scripts/spam-regularStrain

@@ -20,6 +20,7 @@ this program.  If not, see <http://www.gnu.org/licenses/>.
 
 import os
 os.environ['OPENBLAS_NUM_THREADS'] = '1'
+os.environ['OMP_NUM_THREADS'] = '1'
 
 import argparse
 import tifffile